Add kill_modal script to manage Modal applications and better handling of file and terminal tools

- Introduced a new script, `kill_modal.sh`, to facilitate stopping running Modal apps, including the ability to stop all apps or specific swe-rex sandboxes.
- Enhanced user experience with clear usage instructions and feedback during the stopping process.
- Improved error handling to ensure smooth execution even if some apps fail to stop.

scripts/kill_modal.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+# Kill all running Modal apps (sandboxes, deployments, etc.)
+#
+# Usage:
+#   bash scripts/kill_modal.sh          # Stop swe-rex (the sandbox app)
+#   bash scripts/kill_modal.sh --all    # Stop ALL Modal apps
+
+set -uo pipefail
+
+echo "Fetching Modal app list..."
+APP_LIST=$(modal app list 2>/dev/null)
+
+if [[ "${1:-}" == "--all" ]]; then
+    echo "Stopping ALL Modal apps..."
+    echo "$APP_LIST" | grep -oE 'ap-[A-Za-z0-9]+' | sort -u | while read app_id; do
+        echo "  Stopping $app_id"
+        modal app stop "$app_id" 2>/dev/null || true
+    done
+else
+    echo "Stopping swe-rex sandboxes..."
+    APPS=$(echo "$APP_LIST" | grep 'swe-rex' | grep -oE 'ap-[A-Za-z0-9]+' || true)
+    if [[ -z "$APPS" ]]; then
+        echo "  No swe-rex apps found."
+    else
+        echo "$APPS" | while read app_id; do
+            echo "  Stopping $app_id"
+            modal app stop "$app_id" 2>/dev/null || true
+        done
+    fi
+fi
+
+echo ""
+echo "Current swe-rex status:"
+modal app list 2>/dev/null | grep -E 'State|swe-rex' || echo "  (none)"